GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.5
–
2017-05-11
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved.
Page 44 of 77
V
IL
Output high
level V
OH
2.2V
3.0V
Output low level
V
OL
0V
0.35V
The table below shows the signals of the GE864-QUAD V2 serial
port:
RS232
Pin
Number
Signal
GE864-QUAD
V2 Pad
Number
Name
Usage
1
DCD
–
dcd_uart
D9
Data Carrier Detect
Output from the GE864-QUAD V2 that
indicates the carrier presence
2
RXD
–
tx_uart
H8
Transmit line *see
Note
Output transmit line of GE864-QUAD V2 UART
3
TXD
–
rx_uart
E7
Receive line *see
Note
Input receive of the GE864-QUAD V2 UART
4
DTR
–
dtr_uart
B7
Data Terminal Ready
Input to the GE864-QUAD V2 that controls
the DTE READY condition
5
GND
A1,F1, H1
L1, H2, L2,
J3, K3….
Ground
ground
6
DSR
–
dsr_uart
E11
Data Set Ready
Output from the GE864-QUAD V2 that
indicates the module is ready
7
RTS
–
rts_uart
F7
Request to Send
Input to the GE864-QUAD V2 that controls
the Hardware flow control
8
CTS
–
cts_uart
F6
Clear to Send
Output from the GE864-QUAD V2 that controls
the Hardware flow control
9
RI
–
ri_uart B6
Ring Indicator
Output from the GE864-QUAD V2 that
indicates the incoming call condition
NOTE:
According to V.24, RX/TX signal names are referred to the application side, therefore
on the GE864-QUAD V2 side these signal are on the opposite direction: TXD on the
application side will be connected to the receive line (here named TXD/ rx_uart ) of
the GE864-QUAD V2 serial port and viceversa for RX
TIP:
For a minimum implementation, only the TXD and RXD lines can
be connected, the other lines can be left open provided a
software flow control is implemented.
NOTE:
